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Shivani siva
@shivani-siva
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Joined: Aug 6, 2021
Last seen: Sep 10, 2021
Topics: 289 / Replies: 1732
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Answer to: Two vessels containing gases A and B are interconnected as shown in the figure. The stopper is opened, the gases are allowed to mix homogeneously.

(c) 4.8 and 2 atm Explanation: Moles of A, (nA) = = = Moles of B, (nB) = = = Total pressure × total volume = (nA + nB) × RT p ...

3 years ago
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Answer to: A bubble of the gas released at the bottom of a lake increases to eight times the original volume when it reaches the surface.

Correct answer: (d) 70 m Explanation: Let V be the original volume of bubble. The final volume will be 8 V. Let p be the atmospheric pressure and ...

3 years ago
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Answer to: A manifestation of surface tension is (a) rise of liquid in a capillary tube (b) spherical shape of liquid drops

Correct answer: (d) All the above Explanation: All the given phenomenon occurs due to surface tension.

3 years ago
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Answer to: For 1 mol of an ideal gas at a constant temperature T, the plot of log P against log V is a (P : Pressure, V : Volume) (a) Straight line parallel to x-axis. (b) Straight line with a negative slope.

Correct answer: (b) Straight line with a negative slope. Explanation: According to Boyle's law, PV = constant ∴ log P + log V = constant log...

3 years ago
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Answer to: Sulphur dioxide and oxygen were allowed to diffuse through a porous partition. 20 dm^3 of SO2 diffuses through the porous partition in 60 seconds.

Correct answer: (b) 14.1 Explanation: According to Graham’s Law Diffusion: = Since rate of diffusion = ∴ = or = = = = = ...

3 years ago
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Answer to: Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is

Correct answer: Explanation: Let the mass of methane and oxygen = m gm. Mole fraction of O2 = = = = Partial pressure of O2 = To...

3 years ago
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Answer to: Write the name and formula of one salt each which contains : (a) two molecules of water of crystallisation (b) five molecules of water of crystallisation

(a) Gypsum – CaSO4.2H2O (b) Copper sulphate crystals – CuSO4.5H2O (c) Sodium carbonate crystals – Na2CO3.10H2O

3 years ago
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Answer to: A person found that the cake prepared by him is hard and small in size. Which ingredient has he forgotten to add that would have caused the cake to rise and become light? Explain your answer.

Baking powder; When baking powder mixes with water, then sodium hydrogen carbonate reacts with tartaric acid to evolve carbon dioxide gas which get...

3 years ago
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Answer to: A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.

Salt X is like sodium carbonate, Na2CO3, which is made from a strong base and a weak acid. On dissolving in water, salt X gets hydrolysed to form so...

3 years ago
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Answer to: A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. (a) Identify the compound X (b) Write the chemical equation for its preparation.

(a) Compound X is Plaster of Paris. (b) The chemical equation for its preparation is: CaSO4.2H2O + Heat at 100°C + 373K → CaSO4.1/2H2O + 1H2O (c...

3 years ago
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